| Abstract:Hanxing area is a famous skarn iron metallogenic province in China. The alteration-mineralization event of the skarn iron deposits in this area included three stages: (1) garnet-pyroxene stage, during which magmatic hydrothermal fluids reacted upon limestone(marble), forming skarn dominated by andradite and diopside, (2) quartz-iron oxide stage, following the formation of the garnet-pyroxene skarn and accompanied by the hydrous alteration of early minerals; during this stage large amounts of magnetite, hematite, quartz and epidote precipitated; (3) quartz-sulfide stage, during which sulfides precipitated after the deposition of iron oxides, and the mineral assemblage of quartz, chlorite, tremolite, serpentine, calcite, pyrite and chalcopyrite was formed.Through detailed field investigation and laboratory analysis and determination combined with fluid inclusion and stable isotope studies, we estimated temperature, pressure, composition, XCO2/XH2O, salinity, δD，δ18O, δ13C and fO2 of hydrothermal fluids in the process of alteration-mineralization, and the data obtained are given in the text. |
